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main.go
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main.go
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package main
import (
"context"
"database/sql"
"flag"
"fmt"
"io/ioutil"
"log"
"strconv"
"time"
_ "github.com/lib/pq"
"golang.org/x/oauth2/google"
"google.golang.org/api/option"
sheets "google.golang.org/api/sheets/v4"
)
var flags struct {
DSN string
QueryFile string
SpreadsheetID string
SheetID int64
CellRange string
Append bool
CredentialsFile string
TokenFile string
IncludeHeader bool
}
func main() {
flag.StringVar(&flags.DSN, "dsn", "", "database connection string")
flag.StringVar(&flags.QueryFile, "query", "", "SQL file to execute")
flag.StringVar(&flags.SpreadsheetID, "spreadsheet", "", "spreadsheet ID string")
flag.Int64Var(&flags.SheetID, "sheet", 0, "sheet ID integer")
flag.BoolVar(&flags.Append, "append", false, "append to spreadsheet, not overwrite")
flag.StringVar(&flags.CredentialsFile, "credentials", "credentials.json", "credentials file")
flag.StringVar(&flags.TokenFile, "token", "token.json", "token storage file")
flag.BoolVar(&flags.IncludeHeader, "header", false, "include header in result")
flag.Parse()
dbh, err := sql.Open("postgres", flags.DSN)
if err != nil {
log.Fatalf("Unable to open database connection: %v", err)
}
q, err := ioutil.ReadFile(flags.QueryFile)
if err != nil {
log.Fatalf("Unable to read query file: %v", err)
}
b, err := ioutil.ReadFile(flags.CredentialsFile)
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
config, err := google.ConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets")
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config, flags.TokenFile)
ctx := context.Background()
srv, err := sheets.NewService(ctx, option.WithHTTPClient(client))
if err != nil {
log.Fatalf("Unable to retrieve Sheets client: %v", err)
}
fmt.Println("Executing query...")
rows, err := dbh.QueryContext(ctx, string(q))
if err != nil {
log.Fatalf("Failed to execute query: %v", err)
}
cols, err := rows.Columns()
if err != nil {
log.Fatalf("Failed to detect result columns: %v", err)
}
if len(cols) == 0 {
log.Fatalf("No columns in result.")
}
var resultRows []*sheets.RowData
if flags.IncludeHeader && !flags.Append {
cells := make([]*sheets.CellData, len(cols))
for i, v := range cols {
cells[i] = makeCell(v)
}
resultRows = append(resultRows, &sheets.RowData{Values: cells})
}
dataRow := make([]interface{}, len(cols))
dataRowRefs := make([]interface{}, len(cols))
for i := range cols {
dataRowRefs[i] = &dataRow[i]
}
for rows.Next() {
err = rows.Scan(dataRowRefs...)
if err != nil {
log.Fatalf("Failed to scan row: %v", err)
}
resultRows = append(resultRows, makeRow(dataRow))
}
fmt.Println("Updating spreadsheet... ")
var reqs []*sheets.Request
if flags.Append {
reqs = append(reqs, &sheets.Request{
AppendCells: &sheets.AppendCellsRequest{
Fields: "userEnteredValue",
SheetId: flags.SheetID,
Rows: resultRows,
},
})
} else {
reqs = append(reqs, &sheets.Request{
UpdateSheetProperties: &sheets.UpdateSheetPropertiesRequest{
Fields: "gridProperties(rowCount,columnCount)",
Properties: &sheets.SheetProperties{
SheetId: flags.SheetID,
GridProperties: &sheets.GridProperties{
RowCount: int64(len(resultRows)),
ColumnCount: int64(len(cols)),
},
},
},
})
reqs = append(reqs, &sheets.Request{
UpdateCells: &sheets.UpdateCellsRequest{
Fields: "userEnteredValue",
Start: &sheets.GridCoordinate{
SheetId: flags.SheetID,
RowIndex: 0,
ColumnIndex: 0,
},
Rows: resultRows,
},
})
}
call := srv.Spreadsheets.BatchUpdate(
flags.SpreadsheetID,
&sheets.BatchUpdateSpreadsheetRequest{
Requests: reqs,
},
)
_, err = call.Context(ctx).Do()
if err != nil {
log.Fatalf("Unable to retrieve data from sheet: %v", err)
}
fmt.Println("Successfully written.")
}
func makeRow(r []interface{}) *sheets.RowData {
cells := make([]*sheets.CellData, len(r))
for i, v := range r {
cells[i] = makeCell(v)
}
return &sheets.RowData{Values: cells}
}
func makeCell(v interface{}) *sheets.CellData {
toNumberValue := func(f float64) *sheets.CellData {
return &sheets.CellData{
UserEnteredValue: &sheets.ExtendedValue{
NumberValue: &f,
},
}
}
toStringValue := func(s string) *sheets.CellData {
return &sheets.CellData{
UserEnteredValue: &sheets.ExtendedValue{
StringValue: &s,
},
}
}
toBoolValue := func(b bool) *sheets.CellData {
return &sheets.CellData{
UserEnteredValue: &sheets.ExtendedValue{
BoolValue: &b,
},
}
}
switch v := v.(type) {
case nil:
return toStringValue("")
case string:
return toStringValue(v)
case int:
return toNumberValue(float64(v))
case int64:
return toNumberValue(float64(v))
case float64:
return toNumberValue(v)
case bool:
return toBoolValue(v)
case time.Time:
// convert datetime to Excel "serial number"
base := time.Date(2000, 1, 1, 0, 0, 0, 0, v.Location())
days := float64(v.Unix()-base.Unix()) / 86400
return toNumberValue(days + 36526) // 36526 is the serial number for 01.01.2000
case []byte:
f, err := strconv.ParseFloat(string(v), 64)
if err != nil {
return toStringValue(string(v))
} else {
return toNumberValue(f)
}
default:
return toStringValue(fmt.Sprintf("unparsed: %T", v))
}
}